INTRODUCTION
There are several ways to add these symbols to your pages. I will omit consideration of symbols which appear on the keyboard unless, like &, they have a special HTML meaning. Of course, for any symbol, a .gif image can be created and the image displayed using the <img> tag. I will omit consideration of this strategy as well. In the tables below three codes will be given for displaying a character: the HTML numerical code, a code that can be placed between a FONT FACE tag, and a special HTML literal code (where available).

Well, how do you use this stuff? The following samples illustrate the use of each code method. To place a symbol in an HTML page or an email message (readable using a web browser) copy and paste the appropriate code into the file (or message) where you want the symbol.

HTML NUMERIC CODE example: to make a left curly bracket {, type &#123;.

WARNING: Sometimes the numeric code for a symbol is the same as used within FONT FACE tags, but sometimes it's different. For example, &#92; produces \ while <FONT FACE="Symbol">&#92;</FONT> produces \.
Also, while the codes appear to have become "standard" it is possible that some browser will not support certain characters. This will most likely be a problem when using the FONT FACE method.

BROWSER TEST: To view symbols with numeric codes above 255 and perhaps some literal code symbols the browser character encoding must be set to unicode (UTF-8).
If the following string of symbols cannot be read, the browser setting needs to be changed.
Upwards arrow (Numeric code: ↑, Literal code: ↑), intersection (Numeric code: ∩, Literal code: ∩)